人本質性光敏視網膜神經節細胞的功能多樣性
作者:
小柯機器人發布時間:2019/12/6 18:03:40
美國索爾克生物研究所Satchidananda Panda、Ludovic S. Mure等研究人員合作揭示了人類本質性光敏視網膜神經節細胞(ipRGC)的功能多樣性。相關論文發表在2019年12月6日出版的《科學》上。
研究人員使用了人體器官供體的製備方法來測量人體ipRGC的光反應。研究人員發現了三種功能性ipRGC亞型,具有不同的敏感性和對光的響應。一種ipRGC亞型的反應似乎取決於外源發色團的供應,並且該反應在人和小鼠視網膜中均保持不變。視杆細胞和視錐細胞還為ipRGC提供了輸入;然而,每種亞型都以獨特的方式整合了外部視網膜光信號。
據了解,ipRGC是參與圖像形成和非圖像形成視覺反應細胞的亞群。 儘管已經在齧齒動物中描述了ipRGC的功能亞型和形態亞型,但是在靈長類動物或人的視網膜中尚未鑑定出等同的功能亞型。
附:英文原文
Title: Functional diversity of human intrinsically photosensitive retinal ganglion cells
Author: Ludovic S. Mure, Frans Vinberg, Anne Hanneken, Satchidananda Panda
Issue&Volume: 2019/12/06
Abstract: Intrinsically photosensitive retinal ganglion cells (ipRGCs) are a subset of cells that participate in image-forming and non–image-forming visual responses. Although both functional and morphological subtypes of ipRGCs have been described in rodents, parallel functional subtypes have not been identified in primate or human retinas. In this study, we used a human organ donor preparation method to measure human ipRGCs』 photoresponses. We discovered three functional ipRGC subtypes with distinct sensitivities and responses to light. The response of one ipRGC subtype appeared to depend on exogenous chromophore supply, and this response is conserved in both human and mouse retinas. Rods and cones also provided input to ipRGCs; however, each subtype integrated outer retina light signals in a distinct fashion.
DOI: 10.1126/science.aaz0898
Source:https://science.sciencemag.org/content/366/6470/1251
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037